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While lightweight and easy to use, Flask’s built-in server is not suitable
for production as it doesn’t scale well and by default serves only one
request at a time. Some of the options available for properly running Flask in
production are documented here.

If you want to deploy your Flask application to a WSGI server not listed here,
look up the server documentation about how to use a WSGI app with it. Just
remember that your Flask application object is the actual WSGI
application.